【History of Haichuan Pipelines】China’s first domestically produced submarine pipeline
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Pressure testing of the first section of China’s first domestically produced submarine pipeline was successful. Source: Shanghai Baosteel Group Company. Publication date: 2005-07-05. Baosteel’s pipeline steel makes its way from land to the sea; pressure testing of the first section of China’s first domestically produced submarine pipeline was successful. Baosteel’s pipeline steel was well received by users when it was first used in submarine gas pipelines. Recently, the 26.2-kilometer underwater pipeline installed as part of the Guangdong Panyu-Huizhou natural gas development project, which was designed, manufactured, and constructed locally in China, has completed its pressure testing. 24-hour stability tests have shown that the quality of the steel used in this pipeline meets international advanced standards. This indicates that the application areas of Baoguan pipeline steel have successfully expanded from land to the seabed. In recent years, China National Offshore Oil Corporation has been developing natural gas in the South China Sea, laying multiple submarine pipelines in the process. Due to the high requirements for steel in terms of corrosion resistance and compressive strength for underwater pipelines, CNOOC used imported steel for all the underwater oil and gas pipelines it laid in the past. With the increasing number of development projects, CNOOC is actively pursuing a strategy to localize materials. Meanwhile, Baosteel, which represents the highest level of pipeline steel production in the country, continues to improve its research, development, and production capabilities in this area, while actively expanding the applications for pipeline steel. Last year, Baosteel and CNOOC Group jointly signed an agreement to establish a strategic partnership. The first project in which Baosteel participated in the construction of undersea pipelines was the Guangdong Panyu-Huizhou natural gas development project, a **key project**. It represents the deepest and longest natural gas pipeline in China’s undersea waters. This pipeline is used to transport natural gas extracted from the South China Sea to the shore, providing high-quality and clean energy for the development of cities in the Pearl River Delta, while also serving as an alternative fuel for some coal-fired power plants. The project is designed to produce approximately 1.6 billion cubic meters of natural gas per year, with a total length of submarine pipelines of around 364 kilometers. At the beginning of last year, Baosteel dispatched R&D, sales, and production staff to work together with the engineering technicians from CNOOC on the joint development of materials for use under the sea, and improved the production processes in line with international product standards. After numerous tests, the steel for submarine pipelines produced by Baosteel was officially certified by domestic and international experts last June, and mass production began in August. To date, Baosteel has fulfilled all its supply contracts, delivering 70,000 tons of pipeline steel to the CNOOC Guangdong Panyu-Huizhou natural gas development project team. After rigorous testing, all products meet the user requirements.
China’s own pipes used for oil and gas transmission at 1,500 meters depth for the first time Yangtze River News, December 6, 2019. Source: Hunan Daily. Hualing Iron & Steel’s products end reliance on imports; China’s own pipes used for oil and gas transmission at 1,500 meters depth for the first time. According to a report in Hunan Daily dated December 5 (reporter: Huang Lifei; correspondent: Duan Kai), a technical evaluation meeting was held recently in Hengyang regarding the use of 1,500-meter-depth submarine pipeline pipes at the CNOOC Lingshui 17-2 gas field. The trial production and small-scale manufacturing of X65QO submarine pipeline pipes by Hualing Iron & Steel were approved by an expert panel. This is the first time in our country that domestic production of 1,500-meter deep-sea pipelines has been carried out, marking a move away from reliance on imports for such pipelines used in deep-sea oil and gas transportation in China. At present, the development of China’s first self-operated deep-water gas field at sea – the CNOOC Lingshui 17-2 gas field – has been accelerated significantly. The average operating depth of this gas field is 1,500 meters, and its main components include an underwater production system, a semi-submersible platform, as well as associated submarine pipelines. Hualing Henggang is the only domestic supplier of submarine pipeline pipes for the main pipelines of this project, and has successfully produced X65QO submarine pipeline pipes in various specifications since the beginning of this year. At depths of 1,500 meters, where temperatures are low, pressures are high, and the marine environment is complex and variable, there are stringent quality requirements for underwater oil and gas pipelines. In its efforts to overcome technical challenges, Hualing Henggang carefully designs the chemical composition of the pipes and adds special elements to ensure that the pipes possess both strength and toughness ； The processing techniques have been specifically improved to ensure ultra-high precision in the specifications and dimensions of the steel pipes. At the appraisal meeting, the expert group gave full recognition to the achievements in the trial production and small-scale manufacturing of the new domestic oil and gas pipelines for the \"Lingshui 17-2\" project. They unanimously agreed that the relevant production strategies and technical approaches were reasonable, that all product specifications met the requirements outlined in the project specification sheet and relevant standards, and that the conditions for mass production were in place.
【History of Haichuan Pipes】The summary post is being updated continuously; learn about the development process of various pipes at https://bbs.hcbbs.com/thread-3068575-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Forum Website)
There is a type of pipe whose wall thickness exceeds the specified limit.
Breaking news: Risks associated with underwater oil and gas pipelines – Xinhua News Agency, Houston, August 22 (Reporter Gao Lu) According to U.S. media reports on the 22nd, a dredger collided with an underwater gas pipeline in Gulf of Mexico waters off Texas on the 21st, triggering an explosion that resulted in 2 deaths, 6 injuries, and 2 people missing. The accident reportedly occurred at around 8 a.m. on the 21st local time. A dredger collided with an underwater natural gas pipeline near Port Corpus Christi while in operation, resulting in an explosion. The ship caught fire, broke apart and sank; 8 people were rescued, 4 are missing, and 6 injured were taken to hospital for treatment. The fire was extinguished on the evening of the 21st. The U.S. Coast Guard confirmed on the 22nd that search and rescue teams found the bodies of two missing persons that day, and are still searching for the other two missing individuals in the Gulf of Mexico. A local official in Corpus Christi said that the relevant authorities are conducting a thorough investigation into the cause of the accident, as well as carrying out environmental tests in the area where it occurred.
The total length of the submarine pipelines is approximately 364 kilometers. A total of 70,000 tons of pipeline steel were used; the average weight of the steel pipes per kilometer is 190 tons, and the weight of a single steel pipe is 190 kilograms. What is the wall thickness of these steel pipes?
Issue 02, 2012: Domestic steel companies are actively developing submarine pipeline steel By Zhang Ge Abstract: Recently, Baosteel’s Pipe and Bar Division successfully completed two contracts for the supply of 4,500 tons of deep-sea seamless submarine pipeline pipes for the Liwan 3-1 gas field in the South China Sea, as well as 43,000 tons of UOE pipeline pipes for deep-water natural gas transmission. The Liwan 3-1 gas field in the South China Sea is currently China’s first deep-sea (1,500 m depth) gas field, as well as China’s largest and deepest offshore gas field; the development of this field holds great strategic significance.